overclocking fsb only !...

[mikren]

just wondering what kinda problems if any, can you run into by changing the fsb only

[Hoot]

You may have to reduce the multiplier as you increase the FSB, or you may have to increase the core and/or I/O voltage. Other than that, the temp will increase incrementlly as a function of speed increase. Keep an eye on the temps.

Hoot

[BigAir]

In addition to that, some of your cards and devices might not be able to handle the high FSB. The idea way to OC is to mix a good multiplier with as high a FSB as you can get!

[Bartman]

[I'll put the Summery First: Push it as far as it will go, then back it off 1 or 2, if all you have to OC with is the FSB, thats all you can do. If you think your chip will do more, and it is a component crapping out first, try increasing the core voltage slightly.]

I assume you mean leaving your CPU locked?

The only thing to watch (besides the obvious things like heat) is your PCI speed...

At 100fsb the PCI is @ 33mhz (uses a 1/3 divider)
Once you hit 133fsb, it uses a 1/4 divider and is again running at 33mhz.

Anything other then these settings, and you will be overclocking the PCI... some VideoCards dont like more then 38Mhz, and some Harddrives are picky about these things...

Obviously a FSB of 132 would be the worst thing you could have... [just asking to kill something *assuming* it works at this speed [highly unlikly]

You shouldnt have any problem (assuming your chip can handle it) going up to at least a 120fsb.

I can do this on my TB900 (can go higher but this is just for example purposes)... stock is 9x100 = 900, I havnt unlocked it yet, so I have been playing with the FSB. A 120fsb gives me 9x120 = 1080mhz.

Going from 900 to 1080 with just FSB is a pretty good jump.

120fsb is 20% overclocked from 100.

The following would be more desirable: [This is why ppl unlock]

Change the Multiplier to 7, and bump the FSB to 150 (assuming the RAM can do it). This gives me 7x150 = 1050Mhz.

150 is 12.7% overclocked from 133.

The 150 FSB is definatly easier on your systems parts then the 120fsb, and it is faster as well... I believe a 1050Mhz w/150fsb would beat a 1080 w/120fsb in almost all situations, especially if your videocard is the bottle neck which at these speeds it is.

Don't forget that in theory on Athlon systems, the FSB is actually double.
The new Athlon-C chips are "266" (133fsbx2)

100fsb = 200Mhz Bus.
120fsb = 240Mhz Bus.
150fsb = 300Mhz Bus.

It doesnt actually work this way, but it illustrates why the difference from 120 to 150 fsb would yeild faster results.

Hope this helped,

[mikren]

It did help, tks... (no I haven't unlocked yet) waiting on cooling system

[DE]

I can run 150 fsb on a epox 8kta3 w/ tbird 750. Over that my hard drive can't find system files.

mikren (Apr 09, 2001 01:16 p.m.):
It did help, tks... (no I haven't unlocked yet) waiting on cooling system

[!-=sky=-!]

i didn't unlock my cpu yet but with duron 750 i can do 855 -->7.5x150 or somethin like that

[Oni]

DE (Apr 09, 2001 01:49 p.m.):
I can run 150 fsb on a epox 8kta3 w/ tbird 750. Over that my hard drive can't find system files.

I was running my chip at 1200 (8.5*142 @ 1.60), and I think I corrutped some **** on my harddrive. Meh, I've been meaning to format anyways ^_^

[clock-n-roll]

ok, I have an FIC AZ11E mobo and it has a 100/133 jumper
If I were to set this jumper to run at 133 ( I thought the kt133 via chipsets wouldnt do 133) I should be ok, provided the chipset supports it, right?
would this setting affect the agp bus?

currently I have my duron 650@900 9x100, but i would gladly change the multiplier if i could hit 133 fsb!

I`ll gladly pay you Tuesday for a gig today!

Thanks

[$ineX]

I'm trying to do the exact same thing. FSB only overclock. I want my 1ghz athalon 200 fsb to run as a 1 ghz athlon @ 266 fsb. Unfortunalty i have 1600 DDR ram. Anybody know jif this is possible?

[proze]

$ineX (Apr 10, 2001 02:07 p.m.):
I'm trying to do the exact same thing. FSB only overclock. I want my 1ghz athalon 200 fsb to run as a 1 ghz athlon @ 266 fsb. Unfortunalty i have 1600 DDR ram. Anybody know jif this is possible?

i'm not too clued up on ddr ram and mobos, but most chipsets nowadays allow ram and processor to be run at fairly independant speeds. if that's the case, then you shouldn't have problems.

to run your proc at 1ghz, but change the fsb, you'll have to unlock it. there are plenty of posts and articles about on how to do this, so read up. otherwise, i've read your other post, and it seems you have a really good chip on your hands; get better cooling for it, and have a go at overclocking it.

keep reading, and good luck! :)

[DE]

clock-n-roll (Apr 10, 2001 01:49 p.m.):
ok, I have an FIC AZ11E mobo and it has a 100/133 jumper
If I were to set this jumper to run at 133 ( I thought the kt133 via chipsets wouldnt do 133) I should be ok, provided the chipset supports it, right?
would this setting affect the agp bus?

currently I have my duron 650@900 9x100, but i would gladly change the multiplier if i could hit 133 fsb!

I`ll gladly pay you Tuesday for a gig today!

Thanks

Kt133 MB's are supposed to go to 133 but most only do 120 and most aren't stable that high anyway. KT133a boards will do 166 and most are stable til 145-150. IF you set the KT133a to 133 and pci and agp are still at 33mhz so you;ll have no problems associated with them.

[Nagorak]

Bartman (Apr 09, 2001 12:50 p.m.):

Obviously a FSB of 132 would be the worst thing you could have... [just asking to kill something *assuming* it works at this speed [highly unlikly]



Actually, most motherboards switch to a 1/4 divider at either 120 or 124 FSB so 132 should probably work fine.